Tina S. Obut serves as Senior Vice President, Corporate Reserves. Ms. Obut served as Senior Manager of Petroleum Resources at BHP Billiton Petroleum from 2011 to 2012. Prior to that, she served as Senior Vice President, Corporate Reserves for Petrohawk Energy Corporation from 2005 until its sale to BHP Billiton in 2011. From 2004 to 2006, Ms. Obut served as Manager of Reservoir Engineering Evaluations at El Paso Production Company. In addition, she held various engineering, managerial and executive positions at Mission Resources, Ryder Scott Company and Chevron from 1989 to 2006. Ms. Obut graduated from Marietta College with a Bachelor of Science degree in Petroleum Engineering, a Master of Science degree in Petroleum and Natural Gas Engineering from Penn State and a Master of Business Administration degree from the University of Houston. Ms. Obut is a Licensed Professional Engineer in the State of Texas (#82050).